Upload the file boblight-dispmanx located in src to your RPi.

On the RPi
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Check your firmware version with 'vcgencmd version'
If your firmaware version is older than Jul 2 2013 update your firmware.

./boblight-dispmanx -p 5 &

This project compiles against the Raspberry Pi firmware libraries.
The first thing you need, is to get the sources from https://github.com/raspberrypi/firmware
and compile them

Compile the code using these commands:
./configure --without-portaudio --without-x11 --without-libusb
or this command if cross-compiling
./configure --without-portaudio --without-x11 --without-libusb --host=arm-<cross-compiler>

cd src

make SDKSTAGE=<path/to/firmware-directory>